<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>奇思妙想3</title>
    <style>
        div{
           background-color: rosybrown;

        }
        .box{
            width: 1000px;
            height: 200px;
            background-color: salmon;
        }

        .box1{
            background-color: springgreen;
        }
    </style>
</head>
<body>
    <div>hello</div>
    <div class="box">
        <div class="box1">hello fe</div>
    </div>

</body>
</html>